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采用轧制工艺生产GH4169合金异型材,结合实验条件,基于有限元模拟软件建立了单轧槽少道次轧制过程的三维刚塑性有限元模型。采用异型坯作为坯料,分析了轧制过程中孔型充满度、变形温度、等效应变和等效应力的分布情况。模拟结果表明,采用Φ160 mm×200 mm轧机时,初轧温度为1070℃,断面收缩率为45%,单轧槽两道次轧制成形,孔型充满度良好,等效应变约为0.3~1.4。结合模拟结果,在轧机上进行了热轧实验,轧件厚度满足尺寸要求,宽度比成品小2 mm,没有发生晶粒细化。这主要是由于多火次、多次数轧制,使得加热引起的晶粒长大程度大于小变形量引起的晶粒细化程度,使得晶粒未细化,宽度不够。
The GH4169 alloy profile was produced by rolling process. Based on the experimental conditions, the three-dimensional rigid-plastic finite element model of the single pass slotless pass rolling process was established based on the finite element simulation software. Using the blank as blank, the distribution of fullness, deformation temperature, equivalent strain and equivalent stress in the rolling process was analyzed. The simulation results show that when the Φ160 mm × 200 mm rolling mill is used, the initial rolling temperature is 1070 ℃ and the reduction of area is 45%. The single rolling groove is formed by two pass rolling and the hole fullness is good. The equivalent strain is about 0.3 ~ 1.4. Combined with the simulation results, a hot rolling experiment was carried out on the rolling mill. The thickness of the rolled piece meets the requirement of size and the width is 2 mm smaller than the finished product. No grain refinement occurs. This is mainly due to more fire times, multiple rolling, making the grain growth caused by heating is greater than the degree of grain deformation caused by small deformation, making the grain is not refined, the width is not enough.